Laserfiche WebLink
t <br /> -2- <br /> These breaks were all parallel to the strike of underlying <br /> longwall panels 101/1 2 (B bed ) and 208 (M bed) . They were <br /> extremely limited in lateral extent and occurred in a single <br /> isolated area no more than 50 ft by 200 ft. No offset was <br /> noted on any of these breaks . Smooth edges and in-wash <br /> mending indicates these are older cracks ; this specific area <br /> had not been previously detected. A single break down and <br /> away from the ridge t p gave the appearance of having <br /> occurred this year ( green plants in dirt clods had fallen <br /> into the crack) . This feature could be traced for a couple <br /> of hundred feet, from the meadow to the ridge line. Minor <br /> offsets were noted in a few places . Mending by in-wash of <br /> soil material was noted to be underway. <br /> After discovery of these breaks the rest of the meadow was <br /> examined extensively, albeit not exhaustively. No <br /> additional cracking or other potential subsidence features <br /> were observed. <br /> The cracks described in the fall of 1988 had not enlarged, <br /> and in fact only portions of them could be found, much of <br /> their original extent having been filled in by surface wash <br /> or frost heaving . The pond located in the ancient slump <br /> block between the larger crack and the nearest mined-out <br /> area was full , again indicating no additional cracking <br /> toward these old works . <br /> The area will be reexamined during the 1991 summer field <br /> season. <br /> If you have any questions or require any further <br /> information, please so advise . <br /> Very truly yours , <br /> Bruce A. Collins, Ph.D. <br /> Assistant to the President <br /> CPG No . 7016 <br /> a <br /> t <br />